Cronjob to change screen brightness

Tired of your backlight resetting every time you boot your laptop or set it to hibernate? Create a new file containing the following content in /usr/local/bin, and name the file check_backlight

#!/bin/bash
WAIT_TIME=3

LOOP_COUNTER=$\$$((60/$WAIT_TIME))

for i in `seq 1 $\$$LOOP_COUNTER`; do

    DESIRED_BRIGHTNESS=22

    BRIGHTNESS_COMMAND='/usr/bin/intel_backlight '

    BRIGHTNESS_PERCENTAGE=`$\$$BRIGHTNESS_COMMAND | awk '{print $\$$(NF)}'`
    BRIGHTNESS=$\$${BRIGHTNESS_PERCENTAGE%'%'}
    if [ $\$$BRIGHTNESS -ne $\$$DESIRED_BRIGHTNESS ]; then
        BRIGHTNESS_COMMAND+=$\$$DESIRED_BRIGHTNESS

        eval $\$$BRIGHTNESS_COMMAND
    fi
    sleep $\$$WAIT_TIME

done


Now add the following line to /etc/crontab

* *     * * *   root    /bin/bash /usr/local/bin/check_backlight

This entry in crontab will run the script /usr/local/bin/check_backlight every minute. The check_backlight script loops for 60 seconds, checking the backlight every WAIT_TIME seconds.